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How do I convert day-of-year to day-of-month?

package org.kodejava.example.util;
import java.util.Calendar;
public class DayYearToDayMonth {
public static void main(String[] args) {
// Create an instance of calendar for the year 2017 and set the
// day to the 180 day of the year.
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, 2017);
cal.set(Calendar.DAY_OF_YEAR, 180);
// Print the date of the calendar.
System.out.println("Calendar date is: " + cal.getTime());
// To know what day in month of the calendar we can obtain the
// value by calling Calendar's instance get() method and pass
// the Calendar.DAY_OF_MONTH field.
int dayOfMonth = cal.get(Calendar.DAY_OF_MONTH);
// Print which month day is it in number.
System.out.println("Calendar day of month: " + dayOfMonth);
// To know what day in week of the calendar we can obtain the
// value by calling Calendar's instance get() method and pass
// the Calendar.DAY_OF_WEEK field.
int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK);
// Print which week day is it in number.
System.out.println("Calendar day of week: " + dayOfWeek);
}
}

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